Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 65, Issue 4, Pages 1226-1234Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2016.2635653
Keywords
Balanced bandpass filter (BPF); balun BPF; coupling matrix; dual-mode dielectric resonators (DRs)
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Funding
- Natural Science Foundation of Jiangsu Province [BK20161281]
- National Natural Science Foundation of China [61501263, 61471209]
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In this paper, a dual-mode cross-shaped dielectric resonator (DR) that consists of two identical rectangular DRs is investigated to design balanced and balun bandpass filters (BPFs) for the first time. According to the dominant TE11 delta-mode electromagnetic field of a single rectangular DR, the driven signals for the DR through two probes on the two sides of the DR should be antiphase. Equivalently, the extracted signals from the DR operating at TE11 delta mode are positively out-of-phase. Based on this, a four-port balanced TE11 delta-mode BPF using a single dual-mode DR cavity can be constructed. Furthermore, by converting the balanced BPF into a three-port device, a novel balun BPF using the same DR cavity is designed, showcasing excellent performance of amplitude balance and 180 degrees phase difference. To validate the proposed idea, the balanced and balun BPFs are designed and implemented, respectively. Both of them have a miniaturized circuit size due to the adoption of the dual-mode DR. Good agreement can be obtained between their respective simulated and measured results.
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